Gas Question? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Lounge For casual talk about things unrelated to General Motors. In other words, off-topic stuff. And anything else that does not fit Section Description.

Reply
 
 
 
Thread Tools Search this Thread
Old 04-18-2003, 12:22 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Dec 2002
Location: Knox, Indiana
Posts: 398
Thanks: 0
Thanked 0 Times in 0 Posts
tutu67 is on a distinguished road
Default Gas Question?

This is proly a stupid question but how does the gas pump no when to turn off when the car is full? I've always wondered.
tutu67 is offline   Reply With Quote
Old 04-18-2003, 12:33 PM   #2
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default

The back pressure of the gasoline trying to go back into the handle (nozzle) is what shuts it off.
DeathRat is offline   Reply With Quote
Old 04-18-2003, 12:56 PM   #3
Senior Member
True Car Nut
 
Join Date: May 2002
Posts: 2,936
Thanks: 0
Thanked 0 Times in 0 Posts
sse1990 is on a distinguished road
Default

This may help.

When your gas gauge reads empty, your tank is filled with air instead of fuel. As you add fuel, the air must move out of the tank to make way for the gas. Next time you fill your car at the gas station, take a look at the pump nozzle. You will find a hole about a half inch from the end of the nozzle. This hole is connected to a small pipe that travels through the nozzle to the handle.

When you fill your gas tank, some of the displaced air flows through the hole in the nozzle into the pipe. When the tank is full, the hole will be below the gasoline level and no air will pass through the pipe. A mechanical switch inside the nozzle detects when the flow of air stops and shuts off the gas.

You may have noticed that, after the pump shuts off, you can get more gas in your tank by pulling the nozzle out of the tank a bit. This is because you’re moving the position of the hole relative to the gas level and allowing the mechanical switch to reopen.



Does this help at all, LOL
sse1990 is offline   Reply With Quote
Old 04-18-2003, 01:22 PM   #4
Senior Member
Expert Gearhead
 
Join Date: Dec 2002
Location: Mississauga, Ontario
Posts: 20,892
Thanks: 0
Thanked 1 Time in 1 Post
Jim W is on a distinguished road
Default

That just about sums it up nicely. Geez and I was going to respond to this one, but figured the "pros" would understand the science behind the pumpage of gas!

Good summary!
Jim W is offline   Reply With Quote
Old 04-18-2003, 03:45 PM   #5
Senior Member
Posts like a Northstar
 
Join Date: Apr 2003
Location: Milton, Ontario
Posts: 621
Thanks: 0
Thanked 0 Times in 0 Posts
aCiD is on a distinguished road
Default

1990 is close.

That small hole 1990 discussed actually is a venturi creating suction. When the tank is not full, air is being drawn through the hole by the vacuum, and the air flows easily. When gas in the tank rises high enough to block the hole, a mechanical linkage in the handle senses the change in suction and flips the nozzle off.
aCiD is offline   Reply With Quote
Old 04-18-2003, 05:14 PM   #6
Senior Member
True Car Nut
 
Join Date: May 2002
Posts: 2,936
Thanks: 0
Thanked 0 Times in 0 Posts
sse1990 is on a distinguished road
Default

the info I got was from one of the websites I searched for. It came directly from a company ( that deals with them).

I never said I was an expert, LOL
just know how to search.
sse1990 is offline   Reply With Quote
Old 04-18-2003, 07:49 PM   #7
Senior Member
Posts like a Northstar
 
Join Date: Apr 2003
Location: Milton, Ontario
Posts: 621
Thanks: 0
Thanked 0 Times in 0 Posts
aCiD is on a distinguished road
Default

I had researched it a while ago (year or so) while I was bored.
aCiD is offline   Reply With Quote
Old 04-24-2003, 03:21 PM   #8
Junior Member
 
Join Date: Jan 2003
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
zippy95bonne is on a distinguished road
Default My 2 Cents

I always thought that the gas pump was shut off by the same little man who turns the light off when you close the door on the fridge. Hmmmmmmm. For me, the reason why the gas pump shuts off is because it realizes that there is no more money on the credit card I put in there to pay.
zippy95bonne is offline   Reply With Quote
Old 04-24-2003, 05:27 PM   #9
Senior Member
Posts like a 4 Banger
 
Join Date: Apr 2003
Location: San Antonio, Tx
Posts: 130
Thanks: 0
Thanked 0 Times in 0 Posts
junkman is on a distinguished road
Default RICERS

heheheh kinda like the little guy in ricers when they overheat they open the trunk and the lil man screams "Ahhhh hh I told you not to run it so hot" hehehe

JUNKMAN strikes RICERS again lol

BONNES RULE RICERS JUST DONT
junkman is offline   Reply With Quote
Old 04-24-2003, 06:40 PM   #10
Senior Member
True Car Nut
 
Join Date: Jun 2002
Location: Bedroom, Ontario
Posts: 3,266
Thanks: 0
Thanked 0 Times in 0 Posts
Drifter420 is on a distinguished road
Default

OK.. Where'* the overfill gas valve located? I've been told that when it stops.. that'* it.. you're tank is full.. and when people always try to narrow it to the closest dollar ( duh.. that'* why you pay with debit and plastic ) they are actually supposedly just wastin money and fuel. I heard this from one of them car shows 2 years ago.. is this valid ?
Drifter420 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
"real" gas or ethanol gas Suitcase Lounge 24 10-20-2013 12:41 AM
Gas leaking from top of gas tank on 89 Bonne crazycrawler 1987-1991 6 03-25-2010 12:19 AM
Gas Cap. Don't Let others steal your gas 03SSEISUPERCHARGED General GM Chat 26 05-04-2008 09:36 PM
Gas, Oil And Gas Mileage **** SERIES II ENGINES**** Nashville Cowboy General GM Chat 26 02-06-2007 06:23 PM
Gas stations. Is there really such thing as bad gas? ComfyCar General GM Chat 29 07-18-2005 03:04 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:19 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.